[Normal lymph node cross sections in different anatomic regions and their significance for computed tomographic...

Area of Science:

• Radiology
• Medical Imaging
• Lymphatic System Diagnostics

Background:

• Accurate measurement of lymph node dimensions is essential for diagnosing lymphatic abnormalities.
• Previous studies may lack comprehensive data on normal lymph node size across various anatomical regions.
• Establishing reliable reference ranges is critical for interpreting imaging studies like computed tomography and sonography.

Purpose of the Study:

• To determine the upper limits of normal lymph node cross-section measurements in different anatomical regions.
• To provide reference values for retrocrural, lumbar, iliac, and inguinal lymph nodes based on lymphography.
• To assess potential differences in normal lymph node size between sexes and body sides.

Main Methods:

• Standard bipedal lymphograms were performed on 102 patients without evidence of lymphatic disease.
• Lymph node cross-section measurements were taken from various anatomical regions.
• Geometric magnification corrections were applied, and statistical analyses (mean, standard deviation, median, Gaussian distribution, 95% confidence limits) were calculated.

Main Results:

• Upper limits of normal lymph node cross-section measurements were established: Retrocrural nodes - 7 mm, lumbar nodes - 10 mm, iliac lymph nodes - 12 mm, inguinal lymph nodes - up to 18 mm.
• No statistically significant differences were observed between male and female patients.
• No statistically significant differences were found between the right and left sides of the body.

Conclusions:

• The study provides definitive upper limits for normal lymph node sizes in key anatomical areas.
• These established values are vital for accurate interpretation of imaging modalities in clinical practice.
• The findings highlight the importance of considering size in conjunction with other criteria for malignancy assessment in lymph nodes.